Api.create_request(%Request{}, %{
        ip: to_string(:inet_parse.ntoa(conn.remote_ip)),
        useragent: get_req_header(conn, "user-agent") |> hd,
        code: body,
        user_id: user.id
      })

defmodule UserService.Schema.User do
  use Ecto.Schema
  import Ecto.Changeset

  @derive {Poison.Encoder, only: [:email, :name, :id, :image, :provider]}
  @primary_key {:id, :binary_id, autogenerate: true}
  schema "users" do
    field(:email, :string)
    field(:password, :string, virtual: true)
    field(:password_hash, :string)
    field(:name, :string)
    field(:image, :string)
    field(:provider, :string)

    timestamps()
  end

** (exit) an exception was raised:
    ** (Poison.EncodeError) unable to encode value: {nil, "requests"}

[
  %Sandbox.Api.Request{
    __meta__: #Ecto.Schema.Metadata<:loaded, "requests">,
    code: "<?php\necho 1;",
    id: 462,
    inserted_at: ~N[2018-06-19 12:03:21.742638],
    ip: "52.232.59.222",
    updated_at: ~N[2018-06-19 12:03:21.747655],
    user: #Ecto.Association.NotLoaded<association :user is not loaded>,
    user_id: 1,
    useragent: "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.79 Safari/537.36"
  }
]